package com.heyi.framework.session.ltpatoken;

/** 
 * Encodes and decodes to and from Base64 notation. 
 * 
 * <p> 
 * Change Log: 
 * </p> 
 * <ul> 
 *  <li>v2.1 - Cleaned up javadoc comments and unused variables and methods. Added 
 *   some convenience methods for reading and writing to and from files.</li> 
 *  <li>v2.0.2 - Now specifies UTF-8 encoding in places where the code fails on systems 
 *   with other encodings (like EBCDIC).</li> 
 *  <li>v2.0.1 - Fixed an error when decoding a single byte, that is, when the 
 *   encoded data was a single byte.</li> 
 *  <li>v2.0 - I got rid of methods that used booleans to set options. 
 *   Now everything is more consolidated and cleaner. The code now detects 
 *   when data that's being decoded is gzip-compressed and will decompress it 
 *   automatically. Generally things are cleaner. You'll probably have to 
 *   change some method calls that you were making to support the new 
 *   options format (<tt>int</tt>s that you "OR" together).</li> 
 *  <li>v1.5.1 - Fixed bug when decompressing and decoding to a             
 *   byte[] using <tt>decode( String s, boolean gzipCompressed )</tt>.       
 *   Added the ability to "suspend" encoding in the Output Stream so         
 *   you can turn on and off the encoding if you need to embed base64       
 *   data in an otherwise "normal" stream (like an XML file).</li>   
 *  <li>v1.5 - Output stream pases on flush() command but doesn't do anything itself. 
 *      This helps when using GZIP streams. 
 *      Added the ability to GZip-compress objects before encoding them.</li> 
 *  <li>v1.4 - Added helper methods to read/write files.</li> 
 *  <li>v1.3.6 - Fixed OutputStream.flush() so that 'position' is reset.</li> 
 *  <li>v1.3.5 - Added flag to turn on and off line breaks. Fixed bug in input stream 
 *      where last buffer being read, if not completely full, was not returned.</li> 
 *  <li>v1.3.4 - Fixed when "improperly padded stream" error was thrown at the wrong time.</li> 
 *  <li>v1.3.3 - Fixed I/O streams which were totally messed up.</li> 
 * </ul> 
 * 
 * <p> 
 * I am placing this code in the Public Domain. Do with it as you will. 
 * This software comes with no guarantees or warranties but with 
 * plenty of well-wishing instead! 
 * Please visit <a href="http://iharder.net/base64">http://iharder.net/base64</a> 
 * periodically to check for updates or to contribute improvements. 
 * </p> 
 * 
 * @author Robert Harder 
 * @author [hidden email] 
 * @version 2.1 
 */ 
public class Base64 
{ 
    
/* ********  P U B L I C   F I E L D S  ******** */   
    
    
    /** No options specified. Value is zero. */ 
    public final static int NO_OPTIONS = 0; 
    
    /** Specify encoding. */ 
    public final static int ENCODE = 1; 
    
    
    /** Specify decoding. */ 
    public final static int DECODE = 0; 
    
    
    /** Specify that data should be gzip-compressed. */ 
    public final static int GZIP = 2; 
    
    
    /** Don't break lines when encoding (violates strict Base64 specification) */ 
    public final static int DONT_BREAK_LINES = 8; 
    
    
/* ********  P R I V A T E   F I E L D S  ******** */   
    
    
    /** Maximum line length (76) of Base64 output. */ 
    private final static int MAX_LINE_LENGTH = 76; 
    
    
    /** The equals sign (=) as a byte. */ 
    private final static byte EQUALS_SIGN = (byte)'='; 
    
    
    /** The new line character (\n) as a byte. */ 
    private final static byte NEW_LINE = (byte)'\n'; 
    
    
    /** Preferred encoding. */ 
    private final static String PREFERRED_ENCODING = "UTF-8"; 
    
    
    /** The 64 valid Base64 values. */ 
    private final static byte[] ALPHABET; 
    private final static byte[] _NATIVE_ALPHABET = /* May be something funny like EBCDIC */ 
    { 
        (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G', 
        (byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N', 
        (byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U', 
        (byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z', 
        (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g', 
        (byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n', 
        (byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u', 
        (byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z', 
        (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', 
        (byte)'6', (byte)'7', (byte)'8', (byte)'9', (byte)'+', (byte)'/' 
    }; 
    
    /** Determine which ALPHABET to use. */ 
    static 
    { 
        byte[] __bytes; 
        try 
        { 
            __bytes = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".getBytes( PREFERRED_ENCODING ); 
        }   // end try 
        catch (java.io.UnsupportedEncodingException use) 
        { 
            __bytes = _NATIVE_ALPHABET; // Fall back to native encoding 
        }   // end catch 
        ALPHABET = __bytes; 
    }   // end static 
    
    
    /** 
     * Translates a Base64 value to either its 6-bit reconstruction value 
     * or a negative number indicating some other meaning. 
     **/ 
    private final static byte[] DECODABET = 
    {   
        -9,-9,-9,-9,-9,-9,-9,-9,-9,                 // Decimal  0 -  8 
        -5,-5,                                      // Whitespace: Tab and Linefeed 
        -9,-9,                                      // Decimal 11 - 12 
        -5,                                         // Whitespace: Carriage Return 
        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 14 - 26 
        -9,-9,-9,-9,-9,                             // Decimal 27 - 31 
        -5,                                         // Whitespace: Space 
        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,              // Decimal 33 - 42 
        62,                                         // Plus sign at decimal 43 
        -9,-9,-9,                                   // Decimal 44 - 46 
        63,                                         // Slash at decimal 47 
        52,53,54,55,56,57,58,59,60,61,              // Numbers zero through nine 
        -9,-9,-9,                                   // Decimal 58 - 60 
        -1,                                         // Equals sign at decimal 61 
        -9,-9,-9,                                      // Decimal 62 - 64 
        0,1,2,3,4,5,6,7,8,9,10,11,12,13,            // Letters 'A' through 'N' 
        14,15,16,17,18,19,20,21,22,23,24,25,        // Letters 'O' through 'Z' 
        -9,-9,-9,-9,-9,-9,                          // Decimal 91 - 96 
        26,27,28,29,30,31,32,33,34,35,36,37,38,     // Letters 'a' through 'm' 
        39,40,41,42,43,44,45,46,47,48,49,50,51,     // Letters 'n' through 'z' 
        -9,-9,-9,-9                                 // Decimal 123 - 126 
        /*,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 127 - 139 
        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 140 - 152 
        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 153 - 165 
        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 166 - 178 
        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 179 - 191 
        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 192 - 204 
        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 205 - 217 
        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 218 - 230 
        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 231 - 243 
        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9         // Decimal 244 - 255 */ 
    }; 
    
    // I think I end up not using the BAD_ENCODING indicator. 
    //private final static byte BAD_ENCODING    = -9; // Indicates error in encoding 
    private final static byte WHITE_SPACE_ENC = -5; // Indicates white space in encoding 
    private final static byte EQUALS_SIGN_ENC = -1; // Indicates equals sign in encoding 

    
    /** Defeats instantiation. */ 
    private Base64(){} 
    
    
    
/* ********  E N C O D I N G   M E T H O D S  ******** */     
    
    
    /** 
     * Encodes up to the first three bytes of array <var>threeBytes</var> 
     * and returns a four-byte array in Base64 notation. 
     * The actual number of significant bytes in your array is 
     * given by <var>numSigBytes</var>. 
     * The array <var>threeBytes</var> needs only be as big as 
     * <var>numSigBytes</var>. 
     * Code can reuse a byte array by passing a four-byte array as <var>b4</var>. 
     * 
     * @param b4 A reusable byte array to reduce array instantiation 
     * @param threeBytes the array to convert 
     * @param numSigBytes the number of significant bytes in your array 
     * @return four byte array in Base64 notation. 
     * @since 1.5.1 
     */ 
    private static byte[] encode3to4( byte[] b4, byte[] threeBytes, int numSigBytes ) 
    { 
        encode3to4( threeBytes, 0, numSigBytes, b4, 0 ); 
        return b4; 
    }   // end encode3to4 

    
    /** 
     * Encodes up to three bytes of the array <var>source</var> 
     * and writes the resulting four Base64 bytes to <var>destination</var>. 
     * The source and destination arrays can be manipulated 
     * anywhere along their length by specifying 
     * <var>srcOffset</var> and <var>destOffset</var>. 
     * This method does not check to make sure your arrays 
     * are large enough to accomodate <var>srcOffset</var> + 3 for 
     * the <var>source</var> array or <var>destOffset</var> + 4 for 
     * the <var>destination</var> array. 
     * The actual number of significant bytes in your array is 
     * given by <var>numSigBytes</var>. 
     * 
     * @param source the array to convert 
     * @param srcOffset the index where conversion begins 
     * @param numSigBytes the number of significant bytes in your array 
     * @param destination the array to hold the conversion 
     * @param destOffset the index where output will be put 
     * @return the <var>destination</var> array 
     * @since 1.3 
     */ 
    private static byte[] encode3to4( 
     byte[] source, int srcOffset, int numSigBytes, 
     byte[] destination, int destOffset ) 
    { 
        //           1         2         3   
        // 01234567890123456789012345678901 Bit position 
        // --------000000001111111122222222 Array position from threeBytes 
        // --------|    ||    ||    ||    | Six bit groups to index ALPHABET 
        //          >>18  >>12  >> 6  >> 0  Right shift necessary 
        //                0x3f  0x3f  0x3f  Additional AND 
        
        // Create buffer with zero-padding if there are only one or two 
        // significant bytes passed in the array. 
        // We have to shift left 24 in order to flush out the 1's that appear 
        // when Java treats a value as negative that is cast from a byte to an int. 
        int inBuff =   ( numSigBytes > 0 ? ((source[ srcOffset     ] << 24) >>>  8) : 0 ) 
                     | ( numSigBytes > 1 ? ((source[ srcOffset + 1 ] << 24) >>> 16) : 0 ) 
                     | ( numSigBytes > 2 ? ((source[ srcOffset + 2 ] << 24) >>> 24) : 0 ); 

        switch( numSigBytes ) 
        { 
            case 3: 
                destination[ destOffset     ] = ALPHABET[ (inBuff >>> 18)        ]; 
                destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ]; 
                destination[ destOffset + 2 ] = ALPHABET[ (inBuff >>>  6) & 0x3f ]; 
                destination[ destOffset + 3 ] = ALPHABET[ (inBuff       ) & 0x3f ]; 
                return destination; 
                
            case 2: 
                destination[ destOffset     ] = ALPHABET[ (inBuff >>> 18)        ]; 
                destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ]; 
                destination[ destOffset + 2 ] = ALPHABET[ (inBuff >>>  6) & 0x3f ]; 
                destination[ destOffset + 3 ] = EQUALS_SIGN; 
                return destination; 
                
            case 1: 
                destination[ destOffset     ] = ALPHABET[ (inBuff >>> 18)        ]; 
                destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ]; 
                destination[ destOffset + 2 ] = EQUALS_SIGN; 
                destination[ destOffset + 3 ] = EQUALS_SIGN; 
                return destination; 
                
            default: 
                return destination; 
        }   // end switch 
    }   // end encode3to4 
    
    
    
    /** 
     * Serializes an object and returns the Base64-encoded 
     * version of that serialized object. If the object 
     * cannot be serialized or there is another error, 
     * the method will return <tt>null</tt>. 
     * The object is not GZip-compressed before being encoded. 
     * 
     * @param serializableObject The object to encode 
     * @return The Base64-encoded object 
     * @since 1.4 
     */ 
    public static String encodeObject( java.io.Serializable serializableObject ) 
    { 
        return encodeObject( serializableObject, NO_OPTIONS ); 
    }   // end encodeObject 
    


    /** 
     * Serializes an object and returns the Base64-encoded 
     * version of that serialized object. If the object 
     * cannot be serialized or there is another error, 
     * the method will return <tt>null</tt>. 
     * <p> 
     * Valid options:<pre> 
     *   GZIP: gzip-compresses object before encoding it. 
     *   DONT_BREAK_LINES: don't break lines at 76 characters 
     *     <i>Note: Technically, this makes your encoding non-compliant.</i> 
     * </pre> 
     * <p> 
     * Example: <code>encodeObject( myObj, Base64.GZIP )</code> or 
     * <p> 
     * Example: <code>encodeObject( myObj, Base64.GZIP | Base64.DONT_BREAK_LINES )</code> 
     * 
     * @param serializableObject The object to encode 
     * @param options Specified options 
     * @return The Base64-encoded object 
     * @see Base64#GZIP 
     * @see Base64#DONT_BREAK_LINES 
     * @since 2.0 
     */ 
    public static String encodeObject( java.io.Serializable serializableObject, int options ) 
    { 
        // Streams 
        java.io.ByteArrayOutputStream  baos  = null; 
        java.io.OutputStream           b64os = null; 
        java.io.ObjectOutputStream     oos   = null; 
        java.util.zip.GZIPOutputStream gzos  = null; 
        
        // Isolate options 
        int gzip           = (options & GZIP); 
        int dontBreakLines = (options & DONT_BREAK_LINES); 
        
        try 
        { 
            // ObjectOutputStream -> (GZIP) -> Base64 -> ByteArrayOutputStream 
            baos  = new java.io.ByteArrayOutputStream(); 
            b64os = new Base64.OutputStream( baos, ENCODE | dontBreakLines ); 
    
            // GZip? 
            if( gzip == GZIP ) 
            { 
                gzos = new java.util.zip.GZIPOutputStream( b64os ); 
                oos  = new java.io.ObjectOutputStream( gzos ); 
            }   // end if: gzip 
            else 
                oos   = new java.io.ObjectOutputStream( b64os ); 
            
            oos.writeObject( serializableObject ); 
        }   // end try 
        catch( java.io.IOException e ) 
        { 
            e.printStackTrace(); 
            return null; 
        }   // end catch 
        finally 
        { 
            try{ oos.close();   } catch( Exception e ){} 
            try{ gzos.close();  } catch( Exception e ){} 
            try{ b64os.close(); } catch( Exception e ){} 
            try{ baos.close();  } catch( Exception e ){} 
        }   // end finally 
        
        // Return value according to relevant encoding. 
        try 
        { 
            return new String( baos.toByteArray(), PREFERRED_ENCODING ); 
        }   // end try 
        catch (java.io.UnsupportedEncodingException uue) 
        { 
            return new String( baos.toByteArray() ); 
        }   // end catch 
        
    }   // end encode 
    
    

    /** 
     * Encodes a byte array into Base64 notation. 
     * Does not GZip-compress data. 
     * 
     * @param source The data to convert 
     * @since 1.4 
     */ 
    public static String encodeBytes( byte[] source ) 
    { 
        return encodeBytes( source, 0, source.length, NO_OPTIONS ); 
    }   // end encodeBytes 
    


    /** 
     * Encodes a byte array into Base64 notation. 
     * <p> 
     * Valid options:<pre> 
     *   GZIP: gzip-compresses object before encoding it. 
     *   DONT_BREAK_LINES: don't break lines at 76 characters 
     *     <i>Note: Technically, this makes your encoding non-compliant.</i> 
     * </pre> 
     * <p> 
     * Example: <code>encodeBytes( myData, Base64.GZIP )</code> or 
     * <p> 
     * Example: <code>encodeBytes( myData, Base64.GZIP | Base64.DONT_BREAK_LINES )</code> 
     * 
     * 
     * @param source The data to convert 
     * @param options Specified options 
     * @see Base64#GZIP 
     * @see Base64#DONT_BREAK_LINES 
     * @since 2.0 
     */ 
    public static String encodeBytes( byte[] source, int options ) 
    {   
        return encodeBytes( source, 0, source.length, options ); 
    }   // end encodeBytes 
    
    
    /** 
     * Encodes a byte array into Base64 notation. 
     * Does not GZip-compress data. 
     * 
     * @param source The data to convert 
     * @param off Offset in array where conversion should begin 
     * @param len Length of data to convert 
     * @since 1.4 
     */ 
    public static String encodeBytes( byte[] source, int off, int len ) 
    { 
        return encodeBytes( source, off, len, NO_OPTIONS ); 
    }   // end encodeBytes 
    
    

    /** 
     * Encodes a byte array into Base64 notation. 
     * <p> 
     * Valid options:<pre> 
     *   GZIP: gzip-compresses object before encoding it. 
     *   DONT_BREAK_LINES: don't break lines at 76 characters 
     *     <i>Note: Technically, this makes your encoding non-compliant.</i> 
     * </pre> 
     * <p> 
     * Example: <code>encodeBytes( myData, Base64.GZIP )</code> or 
     * <p> 
     * Example: <code>encodeBytes( myData, Base64.GZIP | Base64.DONT_BREAK_LINES )</code> 
     * 
     * 
     * @param source The data to convert 
     * @param off Offset in array where conversion should begin 
     * @param len Length of data to convert 
     * @param options Specified options 
     * @see Base64#GZIP 
     * @see Base64#DONT_BREAK_LINES 
     * @since 2.0 
     */ 
    public static String encodeBytes( byte[] source, int off, int len, int options ) 
    { 
        // Isolate options 
        int dontBreakLines = ( options & DONT_BREAK_LINES ); 
        int gzip           = ( options & GZIP   ); 
        
        // Compress? 
        if( gzip == GZIP ) 
        { 
            java.io.ByteArrayOutputStream  baos  = null; 
            java.util.zip.GZIPOutputStream gzos  = null; 
            Base64.OutputStream            b64os = null; 
            
    
            try 
            { 
                // GZip -> Base64 -> ByteArray 
                baos = new java.io.ByteArrayOutputStream(); 
                b64os = new Base64.OutputStream( baos, ENCODE | dontBreakLines ); 
                gzos  = new java.util.zip.GZIPOutputStream( b64os ); 
            
                gzos.write( source, off, len ); 
                gzos.close(); 
            }   // end try 
            catch( java.io.IOException e ) 
            { 
                e.printStackTrace(); 
                return null; 
            }   // end catch 
            finally 
            { 
                try{ gzos.close();  } catch( Exception e ){} 
                try{ b64os.close(); } catch( Exception e ){} 
                try{ baos.close();  } catch( Exception e ){} 
            }   // end finally 

            // Return value according to relevant encoding. 
            try 
            { 
                return new String( baos.toByteArray(), PREFERRED_ENCODING ); 
            }   // end try 
            catch (java.io.UnsupportedEncodingException uue) 
            { 
                return new String( baos.toByteArray() ); 
            }   // end catch 
        }   // end if: compress 
        
        // Else, don't compress. Better not to use streams at all then. 
        else 
        { 
            // Convert option to boolean in way that code likes it. 
            boolean breakLines = dontBreakLines == 0; 
            
            int    len43   = len * 4 / 3; 
            byte[] outBuff = new byte[   ( len43 )                      // Main 4:3 
                                       + ( (len % 3) > 0 ? 4 : 0 )      // Account for padding 
                                       + (breakLines ? ( len43 / MAX_LINE_LENGTH ) : 0) ]; // New lines       
            int d = 0; 
            int e = 0; 
            int len2 = len - 2; 
            int lineLength = 0; 
            for( ; d < len2; d+=3, e+=4 ) 
            { 
                encode3to4( source, d+off, 3, outBuff, e ); 

                lineLength += 4; 
                if( breakLines && lineLength == MAX_LINE_LENGTH ) 
                {   
                    outBuff[e+4] = NEW_LINE; 
                    e++; 
                    lineLength = 0; 
                }   // end if: end of line 
            }   // en dfor: each piece of array 

            if( d < len ) 
            { 
                encode3to4( source, d+off, len - d, outBuff, e ); 
                e += 4; 
            }   // end if: some padding needed 

            
            // Return value according to relevant encoding. 
            try 
            { 
                return new String( outBuff, 0, e, PREFERRED_ENCODING ); 
            }   // end try 
            catch (java.io.UnsupportedEncodingException uue) 
            { 
                return new String( outBuff, 0, e ); 
            }   // end catch 
            
        }   // end else: don't compress 
        
    }   // end encodeBytes 
    

    
    
    
/* ********  D E C O D I N G   M E T H O D S  ******** */ 
    
    
    /** 
     * Decodes four bytes from array <var>source</var> 
     * and writes the resulting bytes (up to three of them) 
     * to <var>destination</var>. 
     * The source and destination arrays can be manipulated 
     * anywhere along their length by specifying 
     * <var>srcOffset</var> and <var>destOffset</var>. 
     * This method does not check to make sure your arrays 
     * are large enough to accomodate <var>srcOffset</var> + 4 for 
     * the <var>source</var> array or <var>destOffset</var> + 3 for 
     * the <var>destination</var> array. 
     * This method returns the actual number of bytes that 
     * were converted from the Base64 encoding. 
     * 
     * 
     * @param source the array to convert 
     * @param srcOffset the index where conversion begins 
     * @param destination the array to hold the conversion 
     * @param destOffset the index where output will be put 
     * @return the number of decoded bytes converted 
     * @since 1.3 
     */ 
    private static int decode4to3( byte[] source, int srcOffset, byte[] destination, int destOffset ) 
    { 
        // Example: Dk== 
        if( source[ srcOffset + 2] == EQUALS_SIGN ) 
        { 
            // Two ways to do the same thing. Don't know which way I like best. 
            //int outBuff =   ( ( DECODABET[ source[ srcOffset    ] ] << 24 ) >>>  6 ) 
            //              | ( ( DECODABET[ source[ srcOffset + 1] ] << 24 ) >>> 12 ); 
            int outBuff =   ( ( DECODABET[ source[ srcOffset    ] ] & 0xFF ) << 18 ) 
                          | ( ( DECODABET[ source[ srcOffset + 1] ] & 0xFF ) << 12 ); 
            
            destination[ destOffset ] = (byte)( outBuff >>> 16 ); 
            return 1; 
        } 
        
        // Example: DkL= 
        else if( source[ srcOffset + 3 ] == EQUALS_SIGN ) 
        { 
            // Two ways to do the same thing. Don't know which way I like best. 
            //int outBuff =   ( ( DECODABET[ source[ srcOffset     ] ] << 24 ) >>>  6 ) 
            //              | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 ) 
            //              | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 ); 
            int outBuff =   ( ( DECODABET[ source[ srcOffset     ] ] & 0xFF ) << 18 ) 
                          | ( ( DECODABET[ source[ srcOffset + 1 ] ] & 0xFF ) << 12 ) 
                          | ( ( DECODABET[ source[ srcOffset + 2 ] ] & 0xFF ) <<  6 ); 
            
            destination[ destOffset     ] = (byte)( outBuff >>> 16 ); 
            destination[ destOffset + 1 ] = (byte)( outBuff >>>  8 ); 
            return 2; 
        } 
        
        // Example: DkLE 
        else 
        { 
            try{ 
            // Two ways to do the same thing. Don't know which way I like best. 
            //int outBuff =   ( ( DECODABET[ source[ srcOffset     ] ] << 24 ) >>>  6 ) 
            //              | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 ) 
            //              | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 ) 
            //              | ( ( DECODABET[ source[ srcOffset + 3 ] ] << 24 ) >>> 24 ); 
            int outBuff =   ( ( DECODABET[ source[ srcOffset     ] ] & 0xFF ) << 18 ) 
                          | ( ( DECODABET[ source[ srcOffset + 1 ] ] & 0xFF ) << 12 ) 
                          | ( ( DECODABET[ source[ srcOffset + 2 ] ] & 0xFF ) <<  6) 
                          | ( ( DECODABET[ source[ srcOffset + 3 ] ] & 0xFF )      ); 

            
            destination[ destOffset     ] = (byte)( outBuff >> 16 ); 
            destination[ destOffset + 1 ] = (byte)( outBuff >>  8 ); 
            destination[ destOffset + 2 ] = (byte)( outBuff       ); 

            return 3; 
            }catch( Exception e){ 
                System.out.println(""+source[srcOffset]+ ": " + ( DECODABET[ source[ srcOffset     ] ]  ) ); 
                System.out.println(""+source[srcOffset+1]+  ": " + ( DECODABET[ source[ srcOffset + 1 ] ]  ) ); 
                System.out.println(""+source[srcOffset+2]+  ": " + ( DECODABET[ source[ srcOffset + 2 ] ]  ) ); 
                System.out.println(""+source[srcOffset+3]+  ": " + ( DECODABET[ source[ srcOffset + 3 ] ]  ) ); 
                return -1; 
            }   //e nd catch 
        } 
    }   // end decodeToBytes 
    
    
    
    
    /** 
     * Very low-level access to decoding ASCII characters in 
     * the form of a byte array. Does not support automatically 
     * gunzipping or any other "fancy" features. 
     * 
     * @param source The Base64 encoded data 
     * @param off    The offset of where to begin decoding 
     * @param len    The length of characters to decode 
     * @return decoded data 
     * @since 1.3 
     */ 
    public static byte[] decode( byte[] source, int off, int len ) 
    { 
        int    len34   = len * 3 / 4; 
        byte[] outBuff = new byte[ len34 ]; // Upper limit on size of output 
        int    outBuffPosn = 0; 
        
        byte[] b4        = new byte[4]; 
        int    b4Posn    = 0; 
        int    i         = 0; 
        byte   sbiCrop   = 0; 
        byte   sbiDecode = 0; 
        for( i = off; i < off+len; i++ ) 
        { 
            sbiCrop = (byte)(source[i] & 0x7f); // Only the low seven bits 
            sbiDecode = DECODABET[ sbiCrop ]; 
            
            if( sbiDecode >= WHITE_SPACE_ENC ) // White space, Equals sign or better 
            { 
                if( sbiDecode >= EQUALS_SIGN_ENC ) 
                { 
                    b4[ b4Posn++ ] = sbiCrop; 
                    if( b4Posn > 3 ) 
                    { 
                        outBuffPosn += decode4to3( b4, 0, outBuff, outBuffPosn ); 
                        b4Posn = 0; 
                        
                        // If that was the equals sign, break out of 'for' loop 
                        if( sbiCrop == EQUALS_SIGN ) 
                            break; 
                    }   // end if: quartet built 
                    
                }   // end if: equals sign or better 
                
            }   // end if: white space, equals sign or better 
            else 
            { 
                System.err.println( "Bad Base64 input character at " + i + ": " + source[i] + "(decimal)" ); 
                return null; 
            }   // end else: 
        }   // each input character 
                                    
        byte[] out = new byte[ outBuffPosn ]; 
        System.arraycopy( outBuff, 0, out, 0, outBuffPosn ); 
        return out; 
    }   // end decode 
    
    
    
    
    /** 
     * Decodes data from Base64 notation, automatically 
     * detecting gzip-compressed data and decompressing it. 
     * 
     * @param s the string to decode 
     * @return the decoded data 
     * @since 1.4 
     */ 
    public static byte[] decode( String s ) 
    {   
        byte[] bytes; 
        try 
        { 
            bytes = s.getBytes( PREFERRED_ENCODING ); 
        }   // end try 
        catch( java.io.UnsupportedEncodingException uee ) 
        { 
            bytes = s.getBytes(); 
        }   // end catch 
        //</change> 
        
        // Decode 
        bytes = decode( bytes, 0, bytes.length ); 
        
        
        // Check to see if it's gzip-compressed 
        // GZIP Magic Two-Byte Number: 0x8b1f (35615) 
        if( bytes != null && bytes.length >= 4 ) 
        { 
            
            int head = ((int)bytes[0] & 0xff) | ((bytes[1] << 8) & 0xff00);       
            if( java.util.zip.GZIPInputStream.GZIP_MAGIC == head ) 
            { 
                java.io.ByteArrayInputStream  bais = null; 
                java.util.zip.GZIPInputStream gzis = null; 
                java.io.ByteArrayOutputStream baos = null; 
                byte[] buffer = new byte[2048]; 
                int    length = 0; 

                try 
                { 
                    baos = new java.io.ByteArrayOutputStream(); 
                    bais = new java.io.ByteArrayInputStream( bytes ); 
                    gzis = new java.util.zip.GZIPInputStream( bais ); 

                    while( ( length = gzis.read( buffer ) ) >= 0 ) 
                    { 
                        baos.write(buffer,0,length); 
                    }   // end while: reading input 

                    // No error? Get new bytes. 
                    bytes = baos.toByteArray(); 

                }   // end try 
                catch( java.io.IOException e ) 
                { 
                    // Just return originally-decoded bytes 
                }   // end catch 
                finally 
                { 
                    try{ baos.close(); } catch( Exception e ){} 
                    try{ gzis.close(); } catch( Exception e ){} 
                    try{ bais.close(); } catch( Exception e ){} 
                }   // end finally 

            }   // end if: gzipped 
        }   // end if: bytes.length >= 2 
        
        return bytes; 
    }   // end decode 


    

    /** 
     * Attempts to decode Base64 data and deserialize a Java 
     * Object within. Returns <tt>null</tt> if there was an error. 
     * 
     * @param encodedObject The Base64 data to decode 
     * @return The decoded and deserialized object 
     * @since 1.5 
     */ 
    public static Object decodeToObject( String encodedObject ) 
    { 
        // Decode and gunzip if necessary 
        byte[] objBytes = decode( encodedObject ); 
        
        java.io.ByteArrayInputStream  bais = null; 
        java.io.ObjectInputStream     ois  = null; 
        Object obj = null; 
        
        try 
        { 
            bais = new java.io.ByteArrayInputStream( objBytes ); 
            ois  = new java.io.ObjectInputStream( bais ); 
        
            obj = ois.readObject(); 
        }   // end try 
        catch( java.io.IOException e ) 
        { 
            e.printStackTrace(); 
            obj = null; 
        }   // end catch 
        catch( java.lang.ClassNotFoundException e ) 
        { 
            e.printStackTrace(); 
            obj = null; 
        }   // end catch 
        finally 
        { 
            try{ bais.close(); } catch( Exception e ){} 
            try{ ois.close();  } catch( Exception e ){} 
        }   // end finally 
        
        return obj; 
    }   // end decodeObject 
    
    
    
    /** 
     * Convenience method for encoding data to a file. 
     * 
     * @param dataToEncode byte array of data to encode in base64 form 
     * @param filename Filename for saving encoded data 
     * @return <tt>true</tt> if successful, <tt>false</tt> otherwise 
     * 
     * @since 2.1 
     */ 
    public static boolean encodeToFile( byte[] dataToEncode, String filename ) 
    { 
        boolean success = false; 
        Base64.OutputStream bos = null; 
        try 
        { 
            bos = new Base64.OutputStream( 
                      new java.io.FileOutputStream( filename ), Base64.ENCODE ); 
            bos.write( dataToEncode ); 
            success = true; 
        }   // end try 
        catch( java.io.IOException e ) 
        { 
            
            success = false; 
        }   // end catch: IOException 
        finally 
        { 
            try{ bos.close(); } catch( Exception e ){} 
        }   // end finally 
        
        return success; 
    }   // end encodeToFile 
    
    
    /** 
     * Convenience method for decoding data to a file. 
     * 
     * @param dataToDecode Base64-encoded data as a string 
     * @param filename Filename for saving decoded data 
     * @return <tt>true</tt> if successful, <tt>false</tt> otherwise 
     * 
     * @since 2.1 
     */ 
    public static boolean decodeToFile( String dataToDecode, String filename ) 
    { 
        boolean success = false; 
        Base64.OutputStream bos = null; 
        try 
        { 
                bos = new Base64.OutputStream( 
                          new java.io.FileOutputStream( filename ), Base64.DECODE ); 
                bos.write( dataToDecode.getBytes( PREFERRED_ENCODING ) ); 
                success = true; 
        }   // end try 
        catch( java.io.IOException e ) 
        { 
            success = false; 
        }   // end catch: IOException 
        finally 
        { 
                try{ bos.close(); } catch( Exception e ){} 
        }   // end finally 
        
        return success; 
    }   // end decodeToFile 
    
    
    
    
    /** 
     * Convenience method for reading a base64-encoded 
     * file and decoding it. 
     * 
     * @param filename Filename for reading encoded data 
     * @return decoded byte array or null if unsuccessful 
     * 
     * @since 2.1 
     */ 
    public static byte[] decodeFromFile( String filename ) 
    { 
        byte[] decodedData = null; 
        Base64.InputStream bis = null; 
        try 
        { 
            // Set up some useful variables 
            java.io.File file = new java.io.File( filename ); 
            byte[] buffer = null; 
            int length   = 0; 
            int numBytes = 0; 
            
            // Check for size of file 
            if( file.length() > Integer.MAX_VALUE ) 
            { 
                System.err.println( "File is too big for this convenience method (" + file.length() + " bytes)." ); 
                return null; 
            }   // end if: file too big for int index 
            buffer = new byte[ (int)file.length() ]; 
            
            // Open a stream 
            bis = new Base64.InputStream( 
                      new java.io.BufferedInputStream( 
                      new java.io.FileInputStream( file ) ), Base64.DECODE ); 
            
            // Read until done 
            while( ( numBytes = bis.read( buffer, length, 4096 ) ) >= 0 ) 
                length += numBytes; 
            
            // Save in a variable to return 
            decodedData = new byte[ length ]; 
            System.arraycopy( buffer, 0, decodedData, 0, length ); 
            
        }   // end try 
        catch( java.io.IOException e ) 
        { 
            System.err.println( "Error decoding from file " + filename ); 
        }   // end catch: IOException 
        finally 
        { 
            try{ bis.close(); } catch( Exception e) {} 
        }   // end finally 
        
        return decodedData; 
    }   // end decodeFromFile 
    
    
    
    /** 
     * Convenience method for reading a binary file 
     * and base64-encoding it. 
     * 
     * @param filename Filename for reading binary data 
     * @return base64-encoded string or null if unsuccessful 
     * 
     * @since 2.1 
     */ 
    public static String encodeFromFile( String filename ) 
    { 
        String encodedData = null; 
        Base64.InputStream bis = null; 
        try 
        { 
            // Set up some useful variables 
            java.io.File file = new java.io.File( filename ); 
            byte[] buffer = new byte[ (int)(file.length() * 1.4) ]; 
            int length   = 0; 
            int numBytes = 0; 
            
            // Open a stream 
            bis = new Base64.InputStream( 
                      new java.io.BufferedInputStream( 
                      new java.io.FileInputStream( file ) ), Base64.ENCODE ); 
            
            // Read until done 
            while( ( numBytes = bis.read( buffer, length, 4096 ) ) >= 0 ) 
                length += numBytes; 
            
            // Save in a variable to return 
            encodedData = new String( buffer, 0, length, Base64.PREFERRED_ENCODING ); 
                
        }   // end try 
        catch( java.io.IOException e ) 
        { 
            System.err.println( "Error encoding from file " + filename ); 
        }   // end catch: IOException 
        finally 
        { 
            try{ bis.close(); } catch( Exception e) {} 
        }   // end finally 
        
        return encodedData; 
        }   // end encodeFromFile 
    
    
    
    
    /* ********  I N N E R   C L A S S   I N P U T S T R E A M  ******** */ 
    
    
    
    /** 
     * A {@link Base64.InputStream} will read data from another 
     * <tt>java.io.InputStream</tt>, given in the constructor, 
     * and encode/decode to/from Base64 notation on the fly. 
     * 
     * @see Base64 
     * @since 1.3 
     */ 
    public static class InputStream extends java.io.FilterInputStream 
    { 
        private boolean encode;         // Encoding or decoding 
        private int     position;       // Current position in the buffer 
        private byte[]  buffer;         // Small buffer holding converted data 
        private int     bufferLength;   // Length of buffer (3 or 4) 
        private int     numSigBytes;    // Number of meaningful bytes in the buffer 
        private int     lineLength; 
        private boolean breakLines;     // Break lines at less than 80 characters 
        
        
        /** 
         * Constructs a {@link Base64.InputStream} in DECODE mode. 
         * 
         * @param in the <tt>java.io.InputStream</tt> from which to read data. 
         * @since 1.3 
         */ 
        public InputStream( java.io.InputStream in ) 
        {   
            this( in, DECODE ); 
        }   // end constructor 
        
        
        /** 
         * Constructs a {@link Base64.InputStream} in 
         * either ENCODE or DECODE mode. 
         * <p> 
         * Valid options:<pre> 
         *   ENCODE or DECODE: Encode or Decode as data is read. 
         *   DONT_BREAK_LINES: don't break lines at 76 characters 
         *     (only meaningful when encoding) 
         *     <i>Note: Technically, this makes your encoding non-compliant.</i> 
         * </pre> 
         * <p> 
         * Example: <code>new Base64.InputStream( in, Base64.DECODE )</code> 
         * 
         * 
         * @param in the <tt>java.io.InputStream</tt> from which to read data. 
         * @param options Specified options 
         * @see Base64#ENCODE 
         * @see Base64#DECODE 
         * @see Base64#DONT_BREAK_LINES 
         * @since 2.0 
         */ 
        public InputStream( java.io.InputStream in, int options ) 
        {   
            super( in ); 
            this.breakLines   = (options & DONT_BREAK_LINES) != DONT_BREAK_LINES; 
            this.encode       = (options & ENCODE) == ENCODE; 
            this.bufferLength = encode ? 4 : 3; 
            this.buffer   = new byte[ bufferLength ]; 
            this.position = -1; 
            this.lineLength = 0; 
        }   // end constructor 
        
        /** 
         * Reads enough of the input stream to convert 
         * to/from Base64 and returns the next byte. 
         * 
         * @return next byte 
         * @since 1.3 
         */ 
        public int read() throws java.io.IOException 
        { 
            // Do we need to get data? 
            if( position < 0 ) 
            { 
                if( encode ) 
                { 
                    byte[] b3 = new byte[3]; 
                    int numBinaryBytes = 0; 
                    for( int i = 0; i < 3; i++ ) 
                    { 
                        try 
                        { 
                            int b = in.read(); 
                            
                            // If end of stream, b is -1. 
                            if( b >= 0 ) 
                            { 
                                b3[i] = (byte)b; 
                                numBinaryBytes++; 
                            }   // end if: not end of stream 
                            
                        }   // end try: read 
                        catch( java.io.IOException e ) 
                        {   
                            // Only a problem if we got no data at all. 
                            if( i == 0 ) 
                                throw e; 
                            
                        }   // end catch 
                    }   // end for: each needed input byte 
                    
                    if( numBinaryBytes > 0 ) 
                    { 
                        encode3to4( b3, 0, numBinaryBytes, buffer, 0 ); 
                        position = 0; 
                        numSigBytes = 4; 
                    }   // end if: got data 
                    else 
                    { 
                        return -1; 
                    }   // end else 
                }   // end if: encoding 
                
                // Else decoding 
                else 
                { 
                    byte[] b4 = new byte[4]; 
                    int i = 0; 
                    for( i = 0; i < 4; i++ ) 
                    { 
                        // Read four "meaningful" bytes: 
                        int b = 0; 
                        do{ b = in.read(); } 
                        while( b >= 0 && DECODABET[ b & 0x7f ] <= WHITE_SPACE_ENC ); 
                        
                        if( b < 0 ) 
                            break; // Reads a -1 if end of stream 
                        
                        b4[i] = (byte)b; 
                    }   // end for: each needed input byte 
                    
                    if( i == 4 ) 
                    { 
                        numSigBytes = decode4to3( b4, 0, buffer, 0 ); 
                        position = 0; 
                    }   // end if: got four characters 
                    else if( i == 0 ){ 
                        return -1; 
                    }   // end else if: also padded correctly 
                    else 
                    { 
                        // Must have broken out from above. 
                        throw new java.io.IOException( "Improperly padded Base64 input." ); 
                    }   // end 
                    
                }   // end else: decode 
            }   // end else: get data 
            
            // Got data? 
            if( position >= 0 ) 
            { 
                // End of relevant data? 
                if( /*!encode &&*/ position >= numSigBytes ) 
                    return -1; 
                
                if( encode && breakLines && lineLength >= MAX_LINE_LENGTH ) 
                { 
                    lineLength = 0; 
                    return '\n'; 
                }   // end if 
                else 
                { 
                    lineLength++;   // This isn't important when decoding 
                                    // but throwing an extra "if" seems 
                                    // just as wasteful. 
                    
                    int b = buffer[ position++ ]; 

                    if( position >= bufferLength ) 
                        position = -1; 

                    return b & 0xFF; // This is how you "cast" a byte that's 
                                     // intended to be unsigned. 
                }   // end else 
            }   // end if: position >= 0 
            
            // Else error 
            else 
            {   
                // When JDK1.4 is more accepted, use an assertion here. 
                throw new java.io.IOException( "Error in Base64 code reading stream." ); 
            }   // end else 
        }   // end read 
        
        
        /** 
         * Calls {@link #read()} repeatedly until the end of stream 
         * is reached or <var>len</var> bytes are read. 
         * Returns number of bytes read into array or -1 if 
         * end of stream is encountered. 
         * 
         * @param dest array to hold values 
         * @param off offset for array 
         * @param len max number of bytes to read into array 
         * @return bytes read into array or -1 if end of stream is encountered. 
         * @since 1.3 
         */ 
        public int read( byte[] dest, int off, int len ) throws java.io.IOException 
        { 
            int i; 
            int b; 
            for( i = 0; i < len; i++ ) 
            { 
                b = read(); 
                
                //if( b < 0 && i == 0 ) 
                //    return -1; 
                
                if( b >= 0 ) 
                    dest[off + i] = (byte)b; 
                else if( i == 0 ) 
                    return -1; 
                else 
                    break; // Out of 'for' loop 
            }   // end for: each byte read 
            return i; 
        }   // end read 
        
    }   // end inner class InputStream 
    
    
    
    
    
    
    /* ********  I N N E R   C L A S S   O U T P U T S T R E A M  ******** */ 
    
    
    
    /** 
     * A {@link Base64.OutputStream} will write data to another 
     * <tt>java.io.OutputStream</tt>, given in the constructor, 
     * and encode/decode to/from Base64 notation on the fly. 
     * 
     * @see Base64 
     * @since 1.3 
     */ 
    public static class OutputStream extends java.io.FilterOutputStream 
    { 
        private boolean encode; 
        private int     position; 
        private byte[]  buffer; 
        private int     bufferLength; 
        private int     lineLength; 
        private boolean breakLines; 
        private byte[]  b4; // Scratch used in a few places 
        private boolean suspendEncoding; 
        
        /** 
         * Constructs a {@link Base64.OutputStream} in ENCODE mode. 
         * 
         * @param out the <tt>java.io.OutputStream</tt> to which data will be written. 
         * @since 1.3 
         */ 
        public OutputStream( java.io.OutputStream out ) 
        {   
            this( out, ENCODE ); 
        }   // end constructor 
        
        
        /** 
         * Constructs a {@link Base64.OutputStream} in 
         * either ENCODE or DECODE mode. 
         * <p> 
         * Valid options:<pre> 
         *   ENCODE or DECODE: Encode or Decode as data is read. 
         *   DONT_BREAK_LINES: don't break lines at 76 characters 
         *     (only meaningful when encoding) 
         *     <i>Note: Technically, this makes your encoding non-compliant.</i> 
         * </pre> 
         * <p> 
         * Example: <code>new Base64.OutputStream( out, Base64.ENCODE )</code> 
         * 
         * @param out the <tt>java.io.OutputStream</tt> to which data will be written. 
         * @param options Specified options. 
         * @see Base64#ENCODE 
         * @see Base64#DECODE 
         * @see Base64#DONT_BREAK_LINES 
         * @since 1.3 
         */ 
        public OutputStream( java.io.OutputStream out, int options ) 
        {   
            super( out ); 
            this.breakLines   = (options & DONT_BREAK_LINES) != DONT_BREAK_LINES; 
            this.encode       = (options & ENCODE) == ENCODE; 
            this.bufferLength = encode ? 3 : 4; 
            this.buffer       = new byte[ bufferLength ]; 
            this.position     = 0; 
            this.lineLength   = 0; 
            this.suspendEncoding = false; 
            this.b4           = new byte[4]; 
        }   // end constructor 
        
        
        /** 
         * Writes the byte to the output stream after 
         * converting to/from Base64 notation. 
         * When encoding, bytes are buffered three 
         * at a time before the output stream actually 
         * gets a write() call. 
         * When decoding, bytes are buffered four 
         * at a time. 
         * 
         * @param theByte the byte to write 
         * @since 1.3 
         */ 
        public void write(int theByte) throws java.io.IOException 
        { 
            // Encoding suspended? 
            if( suspendEncoding ) 
            { 
                super.out.write( theByte ); 
                return; 
            }   // end if: supsended 
            
            // Encode? 
            if( encode ) 
            { 
                buffer[ position++ ] = (byte)theByte; 
                if( position >= bufferLength )  // Enough to encode. 
                { 
                    out.write( encode3to4( b4, buffer, bufferLength ) ); 

                    lineLength += 4; 
                    if( breakLines && lineLength >= MAX_LINE_LENGTH ) 
                    { 
                        out.write( NEW_LINE ); 
                        lineLength = 0; 
                    }   // end if: end of line 

                    position = 0; 
                }   // end if: enough to output 
            }   // end if: encoding 

            // Else, Decoding 
            else 
            { 
                // Meaningful Base64 character? 
                if( DECODABET[ theByte & 0x7f ] > WHITE_SPACE_ENC ) 
                { 
                    buffer[ position++ ] = (byte)theByte; 
                    if( position >= bufferLength )  // Enough to output. 
                    { 
                        int len = Base64.decode4to3( buffer, 0, b4, 0 ); 
                        out.write( b4, 0, len ); 
                        //out.write( Base64.decode4to3( buffer ) ); 
                        position = 0; 
                    }   // end if: enough to output 
                }   // end if: meaningful base64 character 
                else if( DECODABET[ theByte & 0x7f ] != WHITE_SPACE_ENC ) 
                { 
                    throw new java.io.IOException( "Invalid character in Base64 data." ); 
                }   // end else: not white space either 
            }   // end else: decoding 
        }   // end write 
        
        
        
        /** 
         * Calls {@link #write(int)} repeatedly until <var>len</var> 
         * bytes are written. 
         * 
         * @param theBytes array from which to read bytes 
         * @param off offset for array 
         * @param len max number of bytes to read into array 
         * @since 1.3 
         */ 
        public void write( byte[] theBytes, int off, int len ) throws java.io.IOException 
        { 
            // Encoding suspended? 
            if( suspendEncoding ) 
            { 
                super.out.write( theBytes, off, len ); 
                return; 
            }   // end if: supsended 
            
            for( int i = 0; i < len; i++ ) 
            { 
                write( theBytes[ off + i ] ); 
            }   // end for: each byte written 
            
        }   // end write 
        
        
        
        /** 
         * Method added by PHIL. [Thanks, PHIL. -Rob] 
         * This pads the buffer without closing the stream. 
         */ 
        public void flushBase64() throws java.io.IOException 
        { 
            if( position > 0 ) 
            { 
                if( encode ) 
                { 
                    out.write( encode3to4( b4, buffer, position ) ); 
                    position = 0; 
                }   // end if: encoding 
                else 
                { 
                    throw new java.io.IOException( "Base64 input not properly padded." ); 
                }   // end else: decoding 
            }   // end if: buffer partially full 

        }   // end flush 

        
        /** 
         * Flushes and closes (I think, in the superclass) the stream. 
         * 
         * @since 1.3 
         */ 
        public void close() throws java.io.IOException 
        { 
            // 1. Ensure that pending characters are written 
            flushBase64(); 

            // 2. Actually close the stream 
            // Base class both flushes and closes. 
            super.close(); 
            
            buffer = null; 
            out    = null; 
        }   // end close 
        
        
        
        /** 
         * Suspends encoding of the stream. 
         * May be helpful if you need to embed a piece of 
         * base640-encoded data in a stream. 
         * 
         * @since 1.5.1 
         */ 
        public void suspendEncoding() throws java.io.IOException 
        { 
            flushBase64(); 
            this.suspendEncoding = true; 
        }   // end suspendEncoding 
        
        
        /** 
         * Resumes encoding of the stream. 
         * May be helpful if you need to embed a piece of 
         * base640-encoded data in a stream. 
         * 
         * @since 1.5.1 
         */ 
        public void resumeEncoding() 
        { 
            this.suspendEncoding = false; 
        }   // end resumeEncoding 
        
        
        
    }   // end inner class OutputStream 
    
    
}   // end class Base64 
